| Subdistrict | Enum. district | # of links |
| Dawn | 4 | 123 |
| Dawn | 3 | 11 |
| Townships 37 | 32 | 8 |
| Dawn | 2 | 6 |
| Sarnia | 44 | 5 |
| Chatham | 10 | 4 |
| Dawn | 11 | 4 |
| Dresden | 40 | 3 |
| Sarnia | 45 | 3 |
| Stettler | 26 | 3 |
| Point Edward | 55 | 2 |
| Point Edward | 60 | 2 |
| Dawn | 8 | 2 |
| Sarnia | 34 | 1 |
| Sarnia | 29 | 1 |
| Orford | 25 | 1 |
| Westminster Township | 20 | 1 |
| Plympton | 24 | 1 |
| Sarnia | 51 | 1 |
| Brooke | 9 | 1 |
| Wellesley | 10 | 1 |